Structure of the Draco dwarf spheroidal galaxy

Slawomir Piatek, Carlton Pryor, Taft E. Armandroff, Edward W. Olszewski

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This article studies the structure of the Draco dwarf spheroidal galaxy, with an emphasis on the question of whether the spatial distribution of its stars has been affected by the tidal interaction with the Milky Way, using R- and V-band CCD photometry for 11 fields. The article reports coordinates for the center, a position angle of the major axis, and the ellipticity. It also reports the results of searches for asymmetries in the structure of Draco. These results and searches for a "break" in the radial profile and for the presence of principal sequences of Draco in a color-magnitude diagram for regions more than 50′ from the center yield no evidence that tidal forces from the Milky Way have affected the structure of Draco.

Original languageEnglish (US)
Pages (from-to)2511-2524
Number of pages14
JournalAstronomical Journal
Issue number5 1757
StatePublished - May 2002

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Galaxies: dwarf
  • Galaxies: individual (Draco)
  • Galaxies: stellar content
  • Galaxies: structure
  • Local Group


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